随机实验是因果推理的黄金标准，但它们并不总是可行的。
"Randomized experiments are the gold standard for causal inference, but they are not always feasible."
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
The most sustainable building is the one that is already built.
小说中的真相往往比现实更深刻。
在城市社区运营的公司会产生巨大的连锁反应。
Never ask a barber if you need a haircut.